Tunneling-machine.



No. 875,082, I PATENTED DEC. 31, 1907. s, A. KNOWLES & W. E. CARR.

- TUNNELING MACHINE.

APPLICATION FILED JANJ, 1907.

' 4 SHEETS-SHEET 1.

. w v 3 l 1. 1

No. 875,082. P'ATENTE'D DEC. 31. 1907.

' s. A. KNOWLES & W. B. CARR.

TUNNELING MACHINE.

APPLICATION FILED JAN-.7, 1907. I

' 4 SHEETS-SHEET 2.

1%., 875,082. PATENTED D130. 31, 1907,

vs. A. KNOWLES @zw. E. CARR.

TUNN'ELING MACHINE.

APPLICATION FILED J NJI, 1907.

4 SHEETS-SHEET 3.

"entrain s ratus Parana critics.

'SILAS A. KNOWLES AND WALTER E; CARR, OF IDAHO SPRINGS, COLORADO.

TUNnELING-MAcnmn.

Specification of Letters Patent.

Patented Dec. 31, 1907.

Application filed January '7. 1907- Serial No. 351,187.

To all whom it may concern:

Be it knownthat we, SrLAsA. KNOWLES and WALTER E. CARR, citizens of the United States of America, residing at Idaho Springs,

county of-Clear Creek, and State of Colorado, have invented a new and useful Tunneling- Machine, of which the following is a specification.

Our invention relates to improvements in railroad and mine tunneling machines, and the objects of our invention are: First, to provide a reciprocating cutter head tunnel-- ing machine that is ad aptedto cut tunnels in rock for mining andrailroad use. Second, to provide a'tunneling machine that will cut tunnels of angular shape and of any size. Third, to provide a machine that will cut tunnels or drifts or passage-ways for anypurpose into rock, and that will form a tunnel with vertical side walls and with a straight curved or semi-curved form, and that will also cut out a water channel in the floor of the tunnel and grooves in. which to lay and cement rails if desired. Fourth, to provide a tunneling machine having a narrow cutter-head provided with a plurality of removablerock cutting bits that are of the full height of the tunnel or of any desired part of thefull height of the tunnel, and that are adapted to bemoved over the face of the tunnel. Fifth, to provide a tunneling machine in which a reciprocating cutter-head is adapted to be moved across the breast of a tunnel from wall to wall. Sixth, to provide a tunneling machine having a reciprocating cutter-head movement, and a forwardly feeding movement of the cutter-head into rock, and that is adapted to be fed'through an arc of a circle across the predetermined. width of the tunnel as it operatively cuts said tunnel into rock, and that is adapted to be set in the tunnel at different parts of the tunnels height and. be

fixed rigidlyin operative tunnel cutting positions'in said tunnel. And seventh, to provide a simple, practical tunnel cutting ma* chine that 'is adapted to use the common form of chisel edge drill for cuttingthe rock,

and any suitable kind of motor of the com-.

mon form of reciprocating engine, also earn and spring motion, for driving the rock cut- 'ting'bits. We attain these objects by the mechanlsm illustrated in the accompanying. drawings, in winch;

Figure 1, is a horizontal side elevation of a tunneling I machine embodying -our mvcntion. F g.2, is a plan view of Fig. 1. Fig.

3, is a vertical longitudinal central section view of the'same. Fig. 4, isa front elevation of the machine, a portion only of the cutter-head being shown. Fig. 5, is a trans?- verse vertical sectional view of the machine,

taken centrally therethrough... 6, is a perspective view of the cutter-head. Fig. 7, illustrates in perspective the different forms of bits used. Fig. 8, is a side elevation of the machine, showing means forf elevating it to stand at different levels, Figs. 9 and 10 show cutter-heads adapted for different forms of tunnel roofs. manner of placing the cutting bits on one of the cutterheads; Fig. 12, is a diagram illustrating the shap c of ne form of tunnel, and the progressive order of removing or cutting away the rock, and Fig. 13 is a horizontal side elevation of our tunneling machine showing a motor thereon operatively arranged to reciprocate the cutter head...

Similar letters of reference refer to similar parts throughout the several views,

Referring to the drawings, the numeral designates a carriagewhich is mounted on wheels 2; these wheels are secured to axles 3, which may form a part of or be secured to the under side of. the carria c by any suitable means. Ne preferably il ustrate these axles secured to the axles in boxes 4, which are formed on the under side of the carriage and are provided with caps 5, by which the axles are removably secured in their bearings to 'the carriage. This carriage is preferably formed of a low flat body portion 6, from the front and rear tcrminz'il ends of which large lug portions 7 depend, to the bottom of which the axles are journaled adjacent to their inner ends, while through their outer end portions apertures 8 are formed. 'ihese apertures are forn'ied substantially parallel with the axles of the carriage, and in. these apertures we secure tubes 9, preferably by placing bolts through. them and the lugs. 'lhese tubes preferably extend slightly beyond the opposite ends of these lugportions.of the carriage, and in the opposite ends of these tubes we secure nuts 10, which are each provided v ith an axial threaded aperture'in which a threaded rod 11 is threaded, which we term Fig. ll shows thethe wall braces, the inner end of which ex- .e gripping surfacel "l'hese wall -hraeesf' lare adapted to be screwed, againstfthe-s'ide Walls k distance, support a cross yoke '15, which j "Ie'Xtendsf across i fromo ne"'v rod "f v fa'n d isseouredto?eachkendflof therod's' by nuts 16',- which ."are' threaded on the. ends of l the rods to clamp the-yoke to" them; I .5 Anaperturei's formed throughfthe center; of the, yoke, in whioh-onel end 'ofja feedserew "L i .rot t yi maed, suitable-06 1 :8 1 m fl em n fi 9 11 d- 9P- f id s i y'oke-mmbe of the tunnel the 'maohineis; making and ,brace'the carriage against inoy'ementt lhe bpp s 'e ide nft e e .a g p i e end portionsfare also provided with proj eo'lt' .sionf rods extend thr0ugh the1lugsfand ';alon both side's'jfof the carriage; 5nd. 3m; prgyjv'ide'gwith nuts at their ferwg rd ends; which-5am serewedagainst the ends:'ofithe-lugsat: the

head end of the earriagefandwith nut's yvhich arethreaded t'Q-ltherods to screw jag-amt the-outer ends of the lugs. a t the' rear endof the oarriage;thusjrigidly elamping the rods t i thei'lu s-fand{ito,the earriaget Therear. ends-.Sof ;t' ese reds extend trear' 'vvardttjshort to h ether,

'-b is "fi p dt m 4 suitahle" wrneh," andith oppositeendofth'ifs;

T d I srew fis thtea ied securedine;'depending a rankpr' bther OfLS ' 0 :eratingthefeed 'frarneflt wil'l be understood- 't at anysuitable 'feedinggdeyiee may be empl oyed.; This feed frame .-i's;.prbv,i (led fon its opposite sides with proj eeting gnideWaQysZO whiohfitzinto' slider/t ays;21*; .jformed., in the, sides'of aeenfiral-"reeessformed throu h the 5 lon%itudinal;center of tllefeairriageiz- :pliir ouldered steps22 are also formed just.

below I these slideW ay's, on opposite sid'esjf of this central reo.es's,. an( l depending gui deways' 23 are formed on the bottom of the feed frame that fit-slidablylintothese shouldered "steps." The central recess in the earriege-is -formed" .de'ep enough ini the earriage ahdhelow the feed frame tofor'm a clearance space or housextends into this-centralrecess of the feed I serew a' portion of't'he length of the carriage sufficient to allow the. feed frame tobe. fed' reeiproeally on the carriage a port-ion ofits length. 'lIh-is feed-ffralne' is also; pit-(willed x v-ith guideways24, just aboye the slideway in the carriage, and the top of the carriage along the edge of its central reeessfis formed into slidew ays 25," and. adapted- 't'o' project into and fit slidablv into these guirleh ays 24,

while the top portion of t'his feed frame "is partially-ion the sides'ofthe-carriage;

formed-to"e tendoVer and -re'st-fsli'dably on top of thetop portidn oft'he'ear'ria 'e. }Con-" ,sequently there are-e ti-lureilityIoffshding SHIP. I Ifao'es formed partially ibetween'the oarrislge' I Land the feed. frame, iheslidewayof the :carfriageis preferably""rnade separatefrom-the',- body: of the;oarriage -,a11;d isbolt'ed to it by :bolts whiohextend through lugs '26,v that are formed 'partially on the slideWays- .2'5, and

. --The "feed frame, is]- made considerably -.l'onger-than the-barriage, andis adapted to befed reciprooally forwardend backward 1 longitudinally in the, carriage by turning the. feed sorewiirits nut by means of'the erank, {as is well understood, and at its forward, end

it is extendeddownward in front ofthe car'- ri'age to near'thefioor line of the Wheels 2 of --t'he oarria'ge,i'where a pair of Wheels 27 are journaled to ji t a'nd bear andrun on the floor. 0f.xturinelnand-thussnpport this front end .of this j feed frame. "These Wheels are preferably mounted OnjanaX-IefZS, whi'oh 'is journaledin abox; 29, that-is forlnjed-inthe --bottom of the depending end -of -the frame.

This :box -i,s'-preferahly provided with a cap. by which the" axle. is' rerh0vab1y= secured .to :lthe; end "of the frame, .ThejyvhelsQZ'Zfof the I depending lfront'ie'nd; portion of the frame are preferably positioned at the same 'dis-' tance apart asithe wheelsof the oarria e.

The'forward end 'ofthis feed frame is as'o .aJt-ube 30; seour'edinf an. apertureform'edthrough the; forward end of the feed frame. u -abo ye its supporti'iig 'fioor roller and the p v I 'thlealdedYbraoe rocls31, which are-threaded :Whi'le' Iwe ha, Ieillustrateda feed "screw for into nuts" tha't"are secured'in 'the'- pposite ;.the 'threadedbrace rods. The top surface ofthis feed frame-isfinished to form a flat b'earin"g .end sliding surface for a rook arin its length by a pivotal bolt. 34, the center of arm'- isrotatablyfitted, and the pivot bolt is extended down through'the arm and its hub and through the feed flame, a. nut 37 beingthreaded 'toft'he end of the bolt to serew againstthe underside of the feedframe and thus olamp'tlleguide arni and thefee'd frame rigidly but pivotallytog ethef. 5 From its '33, which Wejtenn theguide germ. This @uide x-arin; is fpivota'lly secured tothe feed re.me"intern1ediateof its ends by any. suit,- fab'le character. of a pivotal connection, but, .it ispreferably illustrated-pivotally oonneeted to the feedfran'le about the center of pivotal center the guideerm'extends rearwardto' the end-0f the feed frame and carriage, and forward to. andj'beyon'd the for- Ward end of the feed Jframe, Where'its ex;

A treme end isbifurcatedfinto twofbrwardlyQ 1] 5 .the'topof the feed frame-being provided I lwithaieircular recess 35', injM' hioha hub 36 that is formedon the under. side or theguide extending paralielly arranged thin. but wide ;-arms 38, whichform guideways for bit cutter-head 39, which is reciprocally mounted on them, and these guide arms are a drill preferably extended up above the top surface of the guide arm in order to support the cutter-head 'i'nore centrally of its normal working center or of the height of the tunnel the cutter head is adapted to cut.

W'e preferably illustrate a cutter-head of the full height of the tunnel, altogether our invention contemplates cutter heads made in any length or width of the predetermined size of the tunnel to be bored.- Thus for example, a cutter head of a third or a quarter .or any other proportion of the height and width of any predetermined tunnel could be used, and can be adapted to work at the various third or quarter parts of the height of a tunnel by raising the carriage to different heights of the tunnel the cutter is adapted to cut at a time. Thus, assuming that the cutter head was made to extend from the floor of the tunnel to a height equal to a little more than ,one-half of the heights of the tunnel ,the lower half could be cut in to a predetermined depth of from a few inches to a foot or two, and then the tunneling machine could be raised up in the tunnel firmly as A tunnel.

on jack screws (see Fig. 8) high enough to cut out the upper half of the tunnel to the same depth and to a further predetermined depth before it was lowered, and after the machine is raised it can be braced sidewise against the walls of the tunnel as when'resting on the floor'of the Consequently, if the carriage :is adapted to be raised by jack screws as illus- I trated in Fig. 8, cutter heads of but a uarter or a third or any other portion of the eight of the tunnel could be provided and but a quarter or third or any other proportion of the height of the tunnel can be cut out across the width of the tunnel at a time by making the carriage low enough to-make the first out while resting on the floor of the tunnel.v We referably make the cutter heads of v the ful height of the tunnel it is desired to form, and of a width that will be a smallpart' of the tunnels width; consequently we have illustrated as the preferred construction a cutter head of the full height of the tunnel to be formed, and of asmall part of the tunnels width, which provides a long narrow cutterhead, and the tops of the guide arms are preferably arranged to extend up to about the.

center of the length or height of the cutterhead. The cutter-head comprises along narrow bar of metal ofthickness enough to giveit sufficient strength to be rigid under the work required of it, and of sufficient weight tocause a heavy impact, and through it a pair of slideway recesses positioned and. arranged to permit the cutter-head to be fitted loosely and slidably I piston type,

also be arra along the center of the cutter head.

41 are formed, which are overthe guide Farms 38 of the rock arm 33, and in the upper ends of these slideway recesses two rollers, 42 are pivotally secured therein on a pin 43, which extends through the opposite sides of the cutter-head. These rollers are adapted to rest and roll on the top edges of the guide arms, and they carry the weight of the cutter-head on the top of the guide arms; consequently the cutter-head is rollingly mounted on the guide arms. The central portion of the rear side of the cutterhead between the recess 41, is provided with a hub 44 in which an axial aperture 45 is formed, which is adapted to receive the end of the plunger45 of a powerful reciprocating engine 45, such as'apneumatic or steam, or gasolene or other fluid actuating reci'pro' cating piston engine of the forwardly extending plunger or slugger type as. shown in Fig. 13, or if desired an electrical motor may be operatively arranged to reciprocate the cutter head. We preferably illustrate however, a reciprocating engine of the plunger which is mounted on the guide arm in any suitable manner, and is opera-v tively connected to a supply ofactuatinglf rality of rock cutting bits, which maybe :of

any suitable character or form of'rock-cutting lips. chisel edge form of cutting bit, and in order to adapt it for use with-ourcutterhead we form it .on the ends of T-shaped' or L-shaped or U-shaped bits, 48, 49, and 50 respectively,- as shownin Fi 7, but preferably illustrate thejU-shapedformpf bit-connected to the cutter'head, In order to secure either one of these-forms of bits to the cutter head, we provide. it wi-thfia-pluralityg, of recesses 51, which may be formed in-itsface in any dion the. guide arms'of Wepreferably use, however, the

rection, but which wei 'referably arrange parallel with its length. hese recesses may ged closetogether ifdesired, but wepreferably place them at a short distance apart and make'the cutterhead wide enough to arrangethree recesses in it, two

of which we pla'ce'along the side edges of the cutter head, and 'the'third' recess we form The center recess is preferably formed with a fiat bottom and with square sides, but the corner recesses are cut in from the sides or edges of the cutter head, and consequently they have a side shoulder-on their innersides only. The

face of the cutterhead-is preferably curved with a curve of the radius of the distance from. the ivotal center of the guide arm to thefaceo the cutter head, and the U-shaped cutters are made with aflat base and to fit them, and thecurvature of the cutter head causes the two opposite corner cutters to face outward at a radial angle-from the piv- -.and through the cutter head, but we may employ any preferred manner of securing the cutter to the head, and in order to facilitate the sharpening of the cutters they are pref-- I erably made of short conveniently-handled lengths, and are placed in the recesses and secured in any position along the whole length of the cutter head, the upper and lower cutters being arranged to project beyond the. opposite ends of the cutter head far enough to cut the tunnel enough larger than'the height of the cutter head to allow ample room for the operative movement and manipulation inthe tunnel. By forming the rock cutters in short lengths they can be" easily and quickly attached to and detached from the cutter head, and are easy to handle to resharpen. Theopposite or. rear end of the guide arm from its pivotal center is provided with a curved gear toothed rack 54:, 6f a radius concentric with the pivotal center of the guide arm. This gear toothed segment is engaged by a pinion 55, which is rotatably -mounted on a shaft 56, that is journaled at one end in the feed frame and in a casing 57 at its top-end. A gear wheel 58 is secured to the shaft 56, above the pinion 55, or it may 7 be integral with the said pinion, and a pinion 59 engages the gear wheel 58. This pinion 59 1S secured to .a shaft 60, that is journaled in the feed frame at one end, and also in the casing 57; but it extends above the casing, and a hand grasping wheel 61 is secured to its upper end. The casing 57 is secured to the feedframe by screws 62', and is-arranged' to support the shafts 56 and 60, and to cover the gears and pinions. .The guide arm is turned on its pivotal center to swing across the feed frame and carriage, and from one side of the tunnel to the other, through the medium of the gears, by turning the hand Wheel 61.

' operating the swinging arm 33, we may also the arm may be swung, and automatically employ any suitable mechanism by which reversed at the limit of its movement in each direction.

The operation of our tunnel cutting machine is as-follows: The tunneling machine is positioned in a tunnel, and the carriage is braced rigidly between the side walls, and the engine is started up, which imparts areciprocating movement to the plunger and the cutter-head, which reciprocates bodily on the top edges of the guide Ways of the guide arm, and the cutter head and guide rarm are fed forward by the feed screw as fast as the cutter head cuts into the rock, and as the cutters cut a recess into the rock larger than the cutter head it can be fed directly into and over the breast of the tunnel the .whole distance thefeed screw will feed the feed frame forwardon the carriage, which would be several feet, or if preferred the cutter head can be fed forward to feed-into the rock from three-quarters of an inch to an -inch or two, and then the cutter headand feed frame can be fed back and the guide arm and cutter head can be swung around by the hand operating wheel andgears to the edge of the cut, and a new out be started into, the breast, and then the guide arm and cutter-head be 'moved until another out has been made across the breast of the tunnel; and as v walls of the tunnel, and loosen the wall braces of the carriage and move thccarriage forward to the wheeled" end of the feed' frame, and then again brace the carriage and then releasethe feed frame.

If desired recesses may be made in the side walls for the heads of the jack screws to extend into, which would form an'abutmcnt to the jack screws and carriage, as well asa side braceto the carriage.

By employing cutter heads 62 and 63, as shown in Figs. 9, 10, and 11, the'tunnel roof can be'cut out in a flat arch form or with angular corners. h

In Fig. 12, a diagram of the cross section of a tunnel 64 is shown, the dotted lines showing the order in which it is preferable to remove the rock, when the tunnel 1s of greater height than the length of the cutter head, as for example, a railroad tunnel, and

a gutter 65, is formed in the bottoin of the a tunnel, as shown.

Having described our invention, what we claim as new and desire to secure by Letters Patent, is:

.1. In a tunneling machine, a wheeled car riage', a feed frame slidably mounted n said 1 carriage, means including a feed -screw for While we have illustrated this manner of feeding said feed frame reciprocally in said carriage,- a depending front end portion on said feed frame extending down over thefor- Car wheel mounted-in said end and adapted to support said forward end of said feed frame on the floor of the tunnel.

2. In a tunneling machine, a wheeled carriage adapted to run on the floor of a tunnel, a feed frame having its forward end extending over the forward end of said carriage-towards wardly extending end, a floor engaging wheel.

journaled in the forward and downwardly extendingend of said feed frame, and a feed screw connected to said 'carriageand feed frame and arranged to feed said feed frame reciprocally in said carriage.

4. In a tunneling machine, a rectangularshaped reciprocating cutter-head having a slideway therein and having also a'plurality of parallelly arrangeddrill-bit supporting recesses arranged a short distance apart, two of which extend into and along the opposite corners of said cutter-head and are positioned to point outward at an angle beyond the sides of said cutter-head, drill-bits adapted to fit said. recesses and arranged to project beyond the sides and the ends of said cutter-head, means including bolts for securing said drillbits end to end in a'coi'ltinuous row in each. recess of said cutter-h ad, a supporting guideway for said cutter-head on which said cutter-head is reciprocally mounted and means including any suitable reciprocating movement motor for reciprocating said. cutter head on said guideway.

5. In a tunneling machine, a reciprocating cutter-head having aslidcway therein, a plurality of chisel-edge rocl-i-cutting bits adapted to b secured to the face of so id cutterhead in rows, the outside rows of which and the outside hits of which are arranged to project beyond said cutter-heads, a supporting carriage, a feed frame slidably mounted on said carriage, a supporting guide arm pivotally mounted on said feed fran'ie, means including a manually operated screw for feed ing said guide frame and cutter-head on said carriage operatively in rock-cutting relation to the rock breast of a tunnel.

6. in a tunneling machine, a reciprocating rectangular-shaped cutter-lwad, of the full height of the tunnel, to be cut, and. of a predetermined part of the width of said tunnel in width, a plurality of drill-hits receiving recesses in said cuttmdread, angular drill-bits adapted to fit said recesses, some of which are removably secured at the edges of said cutter hezul to project from it at an outward angle from the cutter-head as to cut an aperture of lar er dimensions than said cutter-. head, clamping bolts extending through said drilhbits and said cuttershead for rernov'ably clamping said drill-bits to'said cutter-head, a guideway support for saidcutter-head, a carriage adapted to be removably set and posir tioned in a tunnel, a feeding frame slidahly mounted on said carriage, said guiding s'uport beijm iiivotall attached to saidfeedin n i Y r:

frame, means for reciprocating said feeding frame,'and means for moving said guideway support and said cutterv head across width of the breast of a tunnel.

7. In a tunneling. machine, a narrow rectangular reciprocating cutter head, of the full height of the tunnel to he driven, in'ovided with vertical and parallelly arranged rows of chisel-edged drill-bits having angular bases, means for securing said drill-hits to said. cut-- ter head, said cutter head having slideway slots therethrough, a supporting guide arm having forward terminal ends which project into saidslideway slots and on which said cutter head is reciprocally mounted, means for reciprocating said cutter-head a "feeding support for said guide arm and said cutter head, aiixed abutment carriage arranged to support said guide arm and its feeding support, and. means for guiding said. cutter head over the surface of the iii-cast of aiunneli and for-feeding it "forward to drill and cut away the breast of tum'iels.

S. in a tunneling machine, a wheeled car riage, a frame reciprocally mount ed thereon, a supporting wheel at the forward end of said frame, a feed screw operatively inoimted in said frame and carriage to recipromilly feed said." frame longitudinally thereon, an oscillating arm pivotally connected to said frame intermediate of its ends, means including gearing at the rear end of said arm and frame for oscillating the forward end of said arm transversely across said carriage and feed frame throughout a predetcrmincd radius, a rordvcntting drill bit supporting head recipmcally mounted on said oscillating arm and comprising a head provided with a plurality or angular-shaped roelceutting drill-bits remove-lily secured to said. head, some of which are arrai'iged to'stand out-- wardly beyond the side edges of said head, and are adapted to cut an aperture in the rock breast of a tunnel of larger area than 'said head and means connected to said drillbit head and conniirising a reciprocating power transmitting motor for reciprocating said drill bits and head to operatively drill rock.

. 9. in a tunneling machine, a wheeled carriage, a feed frame reciprocally mounted. on

the

said carriage, a supporting wheel at the for-w ward end of said feed frame, a rearward c tension to said wheeled frame provided with cross plate, a feed screw rotatably mounted lengthwi.se,.of said carriage a nut 'thre'ade to. said feed screwand" secured to said feed frame, a guide arm pivotallyisecured' tof'said' drill bits on said guide arm; v

' braces,- the. feed frame reciprocally mounted feed frame; haying a gears'egmentjat its rear end, gears; mountedin mesh with said gear, segment, a a drill bit supporting head: r'ecipio= cally mounted on said guide arm, a-plur alit'y tive 3 motor for reciprocating 'sai head and 10.- In a reciprocating tunneling inachine, the combination of the Wheeled carriage,

lateral" adjustable waltbracingdack screws arranged; to rigidly brace' and securdsaidcar riage between the walls of ..-a tunneL'a feed 'fr'arne reciprocally mounted 'dnsaid carriage, supporting wheels on said frame, adjustable wall brac'in jack screwsextending from the opposite. si esof the wheel supported end, of. said 'feed'frame, amok-cutting head and its snpportin'g' arm mounted on said feed frame,

and means includinga reciprocating movemerit motorattach'ed to said head foroperae tively reciprocating and directing said drillun e i 11. In-a tunneling maehine,'the combina tion of the carriage, ,provided I with .wall

ing head to ,drill and'c'iutaway the breast of thereon, means .for reciprocating the feed frame a supporting wheel and wall en gaging braces at the forward ehdof-the feed frame, a guide arm pivotally mounted on said feed frame to swing over the face of the breast of with said gear rack portion'of said guide arm, I

a tunnel, and provided with a gear rack portion, atrain of gearingin operatii'e-inesh srmose I and means for operating said gears to i move said. feed frame, provided with'a plurality of rock cutting .drilhbits, a reciprocating rod pivotally-seeured'to saidcutter head, and as'uitable motor connected to said rod-and adapted to reciprocate said cutter head.

of rock cutting drill-hits removahly secured to said head,and'meansincludin an ,'opera-- tion of a wheeled carri'age, afeedframe slid'ably'. mounted on said carriage the feed screw arranged. to feed said feed frame'recip'rocally in said carriage, a guide arm pivot- :ally conneetedi tosaidfeed frame, a, gear toothed'section at the-rearendof said guide" arm 'atrain'of gears in meshwith'said gear toothed segment,. .an operating hand Wheel terminal end slideways on; the. opp jt vmounted onsaid feed frame; two separated 7 forward end .ofsaid guide frame, acutter'.

head provided with recesses adapted to fit roller pivotallymounted in said cutter head {and ar'ran ed-to support said cutter head reciproeallyonthe ends of said guide arm,.-'a; piston plunger connectedto saidcutter'head',

slidablyover the ends of said guidearms, a

i a suitable-motor connected to .said piston plunger and adapted to impart toit and to said cutter head arecip'ro'cating movement;

anda'plurality ofrock cutting drillfbits re 3 movably secured'to said cutterhead; l

in'presence of two-witnesses.-.

' suns A. KNOWLES; WALTER E. OARR. Witnesses: i I a G. SARGENT-ELLIOTT, Bnssm ITHOMPSON."

I In testimony 'whereofl afiix mysignature. 

